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Molecular dynamics simulations of coaxial carbon nanotubes in relativesliding motion reveal a striking enhancement of friction when phonons whosegroup velocity is close to the sliding velocity of the nanotubes are resonantlyexcited. The effect is analogous to the dramatic increase in air dragexperienced by aircraft flying close to the speed of sound, but differs in thatit can occur in multiple velocity ranges with varying magnitude, depending onthe atomic level structures of the nanotubes. The phenomenon is a general onethat may occur in other nanoscale mechanical systems.Comment: Submitted to Phys. Rev. Lett. ; Presented at APS March Meeting 2006  (Paul Tangney, Bull. A.P.S. 51, 2006

Giant Wave-Drag Enhancement of Friction in Sliding Carbon Nanotubes